| 摘要 |
PROBLEM TO BE SOLVED: To enable transmission of an optical communication signal simply and substantially simultaneously to a plurality of types of receivers having different receivable data speed.SOLUTION: A control circuit 7 is configured to switch a plurality of switch elements Q1 and Q2 with mutually different switching frequencies, to superpose a plurality of types of optical communication signals having different frequencies. When the response speed of a photodetector is sufficiently higher than the frequency of a drive signal S1, as a case of a photodiode, a receiver having the mounted photodetector can receive a high-frequency optical communication signal. On the other hand, when the response speed of a photodetector is lower than the frequency of the drive signal S1, as a case of a CMOS image sensor, a receiver having the mounted photodetector can receive a low-frequency optical communication signal separately by a low pass filter, for example. |
